Final answer:
The nursing care for a 19-year-old with oral cavity cancer involves implementing the nursing process, which includes assessment, diagnosis, planning, implementation, and evaluation. 
Step-by-step explanation:
Nursing Care for a 19-Year-Old with Oral Cavity Cancer
The nursing care for a 19-year-old with cancer of the oral cavity would involve implementing the nursing process, which consists of assessment, diagnosis, planning, implementation, and evaluation.
- Assessment: Assessing the patient for symptoms, pain level, nutritional status, and psychosocial needs.
 - Diagnosis: Identifying the nursing diagnoses related to the patient's condition, such as impaired oral mucous membrane, altered nutrition, and anxiety.
 - Planning: Developing a care plan that includes goals and interventions to address the nursing diagnoses.
 - Implementation: Providing nursing care such as wound care, pain management, nutrition support, and emotional support.
 - Evaluation: Assessing the effectiveness of the nursing interventions and making adjustments as needed.
 
Post-Operative Complications
There are several post-operative complications that a patient with oral surgery may experience. These include:
- Infection: The surgical site can become infected, leading to increased pain and swelling.
 - Hemorrhage: Excessive bleeding can occur, which may require intervention.
 - Dry Socket: This is a condition where the blood clot that forms after surgery dislodges or dissolves, causing intense pain.
 - Difficulty Swallowing: Swelling and pain can make it difficult for the patient to swallow.
 - Speech Impairment: The surgery can affect muscles and structures involved in speech, resulting in temporary or permanent speech impairment.